Gas igniting and burning device



Nov. 27, 1 934. e. HERB'STER GAS IGNITING AND BURNING DEVICE Filed Jan.30, 1933 2 Sheets-Sheet 1 TTORNEY3 Nov. 27, 1934. HERBSTER 1,982,101

GAS IGNITING AND BURNING DEVICE Filed Jan. 30, 1933 2 Sheets-Sheet 2 '14TTORNE Xi Patented Nov. 27, 1934 UNITED STA GAS IGNITING AND BURNINGDEVICE George Herhater, Cleveland, Ohio, assignmto The ClevelandCooperative Stove Company, Cleveland, Ohio, a corporation of OhioApplication January 30, 1933, Serial No. 654,162

Claims. (01.158-115) This invention relates to an apparatus foreifecting more efllcient firing relation between a service burner'andpilot burner.

One of the principal objects of the present invention is to insuresubstantially instantaneous ignition'of the servicebumer by the pilotburner under the most adverse conditions.

Another object is to provide an ignition burner in firing relation toboth the pilot and-service burners, which ignition burner will operatesubstantially instantaneously with the introductionof fuel thereto.

A more specific object resides in the provision of a new and improvedservice burner having iii combination therewith an ignition burner forthe purpose described.

Another specific object is to provide a new and improved valve forsupplying fuel through different nozzles directly from the feed lineboth to the service burner and to the ignition burner.

Still another object is to provide a valve for this purpose adapted,upon turning in a given direction, first to introduce fuel to theignition burner, and upon subsequent turning in the same 5 direction, tomaintain the flow of fuel to the ignition burner and introduce fuelto'the service burner, whereby the ignition burner may be supplied withfuel'before and concurrently-with the supply to the service burner, andadapted, upon operation of the valve in the opposite direction todiscommunicate the gas supply to the service burner, and subsequentthereto to discommunicate the ignition burner.

Other objects are to provide a valve of this character with a new andimproved clutch means betweenthe operating stem and plug for renderingthe valve more safe from interference by children, and to provide ameans for positively locking the valve in a position to supply gas tothe service burner so as to maintain a' simmering flame thereon. 7

Other objects and advantages will become apparent from the followingspecification wherein reference is made to the drawings.

In the drawings, Fig. l is a plan view of a service and ignition burnerand control valve embodying the principles of the present invention.

Fig. 2 is a side elevation of the burners and valve shown in Fig. 1,part of the burners being shown in section for cleamess in illustration.

Fig. 3 is an enlarged sectional view illustrating the relation betweenthe ignition burner and a pilot light, part being taken on a planeindicated 4 by the line 3--3 of Fig. 1.

56 Fig. 4 is an enlarged sectional view of the com 'trol valve and istaken on a plane indicated by the line 44 of Fig. 2.

Fig. 5 is a sectional view of the valve taken I on a plane indicated bythe line 5-501 Fig. 4; Figs. 6 and 7 are sectional views of the valvetaken on planes indicated by the lines 66 and 7-7 of Fig. 5.

Figs. 8, 9, 10 and 11 are sectional views of the valve taken on a planeindicated by the line 88 01' Fig. 5, showing different operatingpositions of the valve plug; v ig.8 showing the position of the plugwhen both burners are out 01f; Fig. 9 the ignition burner on and theservice burner on; Fig. 10 the ignition burner on and the service'burner at simmering position, and Fig. 11 both burners fully on. v

Fig. 12 is a fragmentary sectional view showsiigg a modified form ofclutch and simmering Fig. 13 is a fragmentary sectional view of aservice burner and a modified type of ignition burner.

In my copending application, Ser. No. 654,161 filed January 30, 1933,the advantages of a plurality of service burners ignited from a commonpilot through the medium of firing tubes have been fully described. Inthe said application, it also has been pointed out that it is desirableto provide an ignition burner for insuring firing relation between thepilot and service burners, the ignition burner and service burner beingcontrolled by the same valve and arranged so that upon turning the valvefrom the closed position in one direction, gas is'first introduced tothe ignition burner and subsequently to the service burner, the supplyto the ignition burner being maintained during the operation of theservice burner and being cut off after the supply to the service burnerhas been cut off. Further, in my copending application I described aparticular discharge nozzle forthe ignition burner to insure lightingthereof and of the service burner consequent upon a flashing through thefiring tube.

Experience has proven that the device therein described operates in avery few seconds. How-, ever, it is desirable that the same operatealmost instantaneously, or about as promptly as the service burner wouldbe ignited were a lighted match held at the discharge vents.

The present invention provides a means for effecting a more promptintroduction of gas to the ignition burner so that a flame isestablished substantially coincident with the discharge of gas mm theservice burner.

vents 3. Communicating interiorly with the head 1 is a mixing chamber 4having at its inlet end a mixing bell 5 into which gas is discharged forsupplying the burner.

The ignition burner comprises a hollow burner head 10 having a mixingchamber 11, the chamber 11 having a mixing bell 12 at the inlet end forreception of gas and air supplied to the ignition burner. The burnerhead 10 may be formed, as described, integral with the service burner,preferably as a continuation of one of the arms 2 thereof. The burner 10and chamber 11, however, are discommunicated from the interior of thehead 1 and chamber 4 except, however, in some cases, a by-pass duct 13,for purposes later to be described, is provided. The ignition burnr head10 is provided with a large vent 15 adapted to receive the neck of adischarge nozzle, later to be described, and better illustrated in Fig.3, the vent 15 preferably being spaced a distance from the end of theoutermost vent 3 of the arm of the burner with which associated.Intermediate the vent 15 and the particular vent 3 described, are aplurality of vents 16, these vents being arranged to be ignitedconsequent upon flashing of gas from the firing'tube and ignition of thejets issuing from the discharge nozzle provided in the vent 15'.

As more fully described in my copending apnlication, this dischargenozzle, designated at 20, is provided withan upright duct 21 whichcommunicates with the interior of the ignition head 10, and a transverseduct 22, communicating with the duct 21 and discharging directly intothe firing tube 23. The firing tube in turn discharges at the oppositeend near the pilot burner 24. A second transverse duct 25 which likewisecommunicates with the duct 21 and preferably dischargesat to the duct 22is provided in the nozzle 20. Mounted on the nozzle 20 is a movable head26 provided with a baffle 27 which depends from the head in spacedrelation to and in front of the discharge opening of the duct 25. Thehead is preferably mounted as illustrated, by means of a screw 28 sothat item be positioned to deflect gas discharged from the duct 25, bothtoward the firing tube and discharge point of the duct 22 and toward thepassages 16 of the ignition burner, so as to-insure a flame from the endof the firing tube to the ignition vents 16.

For introducing gas into the bells 5 and 12 and thus to the respectiveignition and service burners, a gas cock or valve, the body of which isindicated at 30, is provided. -As more fully described hereinafter, thisvalve is provided with ducts directly communicating with a main gassupply pipe and with nozzles 31 and 32 respectively, the nozzle 31discharging into the bell 5 and the nozzle 32 discharging into the bell12- off position,.as it is turned in the direction for communicating theservice burner with the gas supply, gas is first introduced from suchsupply to the nozzle 32 and consequently to the ignition burner. Uponadditional turning in the same direction, gas is supplied to the serviceburner through the nozzle 31, the supply to the ignition burnercontinuing, and, upon additional turning in the same direction, theignition burner continues operation and the flow to the service burneris increased. Since the outlet vents of the ignition burner arerelatively small, if a large amount of gas is supplied through thenozzle 32, it cannot readily pass to the vents 15 and 16 due to the airand back pressure within the mixing passage 11. By increasing the fiowof gas to the nozzle 32, this air can be rapidly expelled but too largea supply of gas through the ignition burner would thereafter exist"during continuous burning. Furthermore, there would ,be a tendency forthe gas to fill the tube 11 more quickly than the air was expelled andconsequently, part of it would back out of the open end of the bell 12.

Again, a small flow of, gas introduced into the comparatively largehead1 requires some few seconds to fill the head and issue from the vents 3.Consequently, it is desirable that a large flow be introduced to theservice burner when first cut on and, in fact, the operator usuallyopens the valve to full open position when first starting the burner.

Since the service burner is provided with a large number of outlets 3,this large volume of gas from the nozzle 31 readily passes into theservice burner, and-substantially no back presthat from the nozzle 31more promptly passes to the service burner so that gas issues from theservice burner at an interval before it issues from the ignition burner.To overcome this objection, and to insure a prompt fiow of gas to theignition burner, the by-pass passage 13, above mentioned, is provided.This passage 13 communicates the interior of the ignition head with theinterior of the service burner head, and is preferably arrahged wellbelow the vents l5 and 16 of the ignition head and in a position out ofthe direct path of movement of the main stream of gas. This opening issufiiciently large so that air in the tube 11 may readily pass into theservice burner, wherefrom it will be exhausted and relieve any backpressure in the chamber 11, and consequently, will permit a rapidinitial flow of gas from the nozzle 32 into the head of the ignitingburner. When the gas in the tube 11 reaches the igniting burner,substantially all the air has been expelled, a small amount only re.-maining in the head. Since the gas is lighter than air, any remainingair will be easily dis-. placed downwardly through the passage 13,permitting the gas to flow readily to the passages 15 and 16 withoutobjectionable back pressure.

By virtue of this by-pass, a larger amount of gas may be suppliedthrough the'nozzle 32 for accelerating the initial flow to the ignitionburner and any excess gas will pass through the bypass 13 and into theadjacent arm 2 of the service burner and thus be discharged through theducts 3 nearest to the ignition burner. As a result, the flame from thefiring tube or the nozzle 20 and issue of gas from the ventsds willoccur substantially at the same time that gas'ilr'st issuing fromadjacent vents 3 of that particular burner arm, so that firing relationis assured. These jets 16 provide sufllcient gas to form a continuouspath between the discharge nozzle 20 and the burner arm so that'theflame may be formed from the nozzle to the vents 3. Obviously, when alarge supply of gas is provided to both the ignition and serviceburners, this supply can substantially equalize through the by-pass 13so that the two act as a single large burner with a few additionalvents. During the period of high flame on the service burner, a venturieffect is produced tending to draw gas from within the ignition burnerinto the service burner through the by-pass. I

In order to effect the proper flow of gasto the respective nozzles 31and 32, a valve, such as illustrated in Figs. 4 to 11 inclusive may beprovided. This valve comprises a body having a suitable plug receivingbore 34 in which is mounted a rotatable plug 35. The body is'providedwith a plurality of ducts, one of which, designated at 36, communicateswith a gas supply and with the bore 34, the others being discharge ducts37 and 38 which communicate with the bore 34 and respectively with thedischarge nozzles 31 and 32. The plug 35 is provided with a radial duct39, positioned axially of the plug to register with the duct 36 in onerotated position of the plug, The plug is also provided with an axiallyextending duct communicating with the duct 39 and with ducts 41 and 42respectively, the ducts 41 and 42 being adapted for registry with therespective ducts 37 and 38 in various rotated positions of the plug 35.The ducts 41 and 42 may be coaxial, the axis thereof being ofisettransversely of the plug from the plug axis, or, if desired, one of saidpassages only may be offset, the axis of the other intersecting andbeing normal to the plug ,axis. hand burner in which the mixing chamberslead-.-

In event the valve is used with a lefting to the respective burners arepositioned oppositely from the burner illustrated, the passages would beoffset in the opposite direction for efiecting the same operatingrelation when the valve-- is turned in the same direction. The reasonfor offsetting the passages 41 and 42 in the manner described is bestillustrated by reference to Figs. 8 to 11 inclusive.

in the ducts 41 and 42 respectively are offset from the ducts 37 and 38,the duct 39 being ofiset'frol'n" If the valve plugis rotated in a theduct 36. counter-clockwise direction, it first assumes a positionillustrated in Fig. 9, wherein the duct 39 is communicated with the duct36 to supply gas into the axial duct 40, the duct 40 being incommunication through the duct 42, with the duct 38 leading to theignition burner nozzle 32 and the duct 41 leading from the duct 40 beingdiscommunicated from the duct 37 leading to the service burner.Consequently, gas will first be supplied only to the ignition burner.Upon continued rotation to the position illustrated in Fig. 10, aslightly increased flow is provided through the duct 42 to the ignitionburner and a sufllcient For example, referring to Fig.. 8, the plug isshown in the cutoff position, where- '3 ting thereof, the registry of asmall amount of the 'duct 42 with the duct 38 will supply as much gas tothe ignition burner nozzle 32 as will be discharged thereby.Consequently, a full flow is maintained from the instant that the duct42 is slightly in register and during the entire period of operation ofthe service burner, regardless of the degreeofflow to the latter.

Obviously, the plug passages and plate 60, later to be described, can bereversed, if circumstances so require, so that the same order ofoperation is obtained by turning the valve clo'clrwise.

. In order to rotate the plug and yet to render it comparatively safefrom operation by children or uninstructed persons who mightinadvertently turn on the gas supply, there is provided a clutch devicefor, eiiecting a connection between the valve stem and the plug, whichdevice normally .is' disconnected and which for connection requires thatthe stem be moved axially inwardly and thence rotated while held in thisinward position.

Referring to Figs. 4 to 7, an operating stem 45 is mounted forindependent rotary and axial movement in a suitable sleeve46 which maybe formed in the end closure cap 47 secured to the body 30. The innerend of the stem protrudes inwardly of the valve body and into a suitablecoaxial recess or bore 48 in the plug 35. The inner endof the stem isprovided with a bore 49 coaxial with the bore 48. In the walls of thestem bore 49 are,longitudinally extending slots 50 which may bepositioned diametrically opposite to each other, and which open at theinner end of the stem. Mounted in the slot 50 is a dental clutch member51 which may be in the form of an H-shaped bar extending diametricallyof the stem 45 and protruding laterally beyond the limits of the stem,the clutch member being positioned against the end wall of the slots 50and secured in place by a suitable pin as illustrated in Figs. 5 and 6.The ends of the clutch member terminate each in a pair of oppositelydisposed clutch teeth, such as indicated at 52 and 53, preferablyextending longitudinally of the stem. A spring 54 is mounted in the stembore, oneend of the spring abutting the end wall of the bore 48 intheplug and the opposite end abut- 'ting the dental clutch member 51 soas to urge it and the stem away from the plug. The plug 35 is providedwith, suitable means adapted for engagement with the inwardly disposedclutch teeth 520! the clutch'member so as to effect rotation of the plugconsequent upon rotation of the clutch. In the form illustrated, suchmeans may comprise recesses, as indicated at 55, adapted forreglstrywith and to receive snugly the clutch teeth 52 when the same arealigned therewith and, moved axially toward the plug.

Referring to Fig. 6, the backing plate 4'7 isprovided with recesses 57positioned for registry with the outwardly extending clutch teeth 53 andadapted to receive these teeth. The recesses 55 and 57 are positionedrelative to each other and to the fuel ducts in the plug so that whenthe plug is in the cut-off position, the recesses 55 and 57 are in axialalignment. Consequently, due to the action of the spring 54, the clutchmember is moved axially away from the plug to dispose the teeth 53within the recesses 57, thus allowing the clutch member 51 to move awayfrom the plug a suflicient distance so that the teeth 52 are disengagedfrom the recesses 55. In this position, the stem is locked and cannot berotated except upon sufficient inward movement of the stem to disengagethe teeth 53 from the recesses 5'7; this amount of-movement beinglikewise sufficient to engage the teeth 52 with the recesses 55 of theplug. Obviously, when the handle is moved axially inwardly to effectthis disengagement and then rotated a slight amount, the outer ends ofthe teeth 53 may bear against the plate 4'7, thus holding the teeth 52in engagement with the recesses in the plug and permitting "rotation ofthe plug and handle together without further inward movement or holdingof the stem inwardly by the operator.

To stop rotation of the stem and plug in off position when moving, fromthe on position, so that clutch teeth 53 are aligned with and may enterthe passages 5'7, stops or nibs 58.-better illustrated in Fig. 6, may beprovided on the plate 4'7, these nibs being conveniently formed from themetal 61 to the body 30 of 'passed the stops 65,

stamped out to form the passages 57.

In some instances, it may be desirable to provide a positive stop andlocking means positioned so that after the valve plug has been rotatedto fully opened position it may be stopped upon return to maintain theflame on the service burner at a suitable height for simmering. Foraccomplishing this purpose, a stop plate 60 may be provided, this platebeing secured by a-suitable screw the valve and being provided with aslot 62 to permit rotation of the same relative to the valve body foreffecting proper adjustment relative to the clutch for the particularsize of simmering flame required. This plate is provided with recesses63 alignable with the recesses 5'7 and elongated slots 64. The metalintermediatethe recesses 63 and slots 64 provides stops 65 which lieinthe path of the teeth 53 when the teeth 53 extend through the slots 64with their ends bearing against the plate 4'7. The duplicate recess,slot, and stop engagement with the respective clutch member.

Referring to Fig. '7, assuming the teeth 53 lie within the passages 5'7;while so received they extend through the recesses 63 in the plate 60.The stem must be moved axially inwardly to disengage the teeth 53 fromthe passages 57 and when in this position, engage the recesses 55 in'the plug so that upon turning the stem, the plug is turned. This inwardmovement should be sufficient to dispose the teeth 53 inwardly from therecesses 63 and stops 65 so that the plug may be fully opened. As soonas the clutch teeth have if the stem is then released, the teeth 53 willbe urged into contact with the plate 4'7 while still in engagement withthe plug teeth 53 of the .recesses 55, and thus held engaged. When soheld, if the stem is rotated in the opposite direction, i. e., towardthe cutoff position, the teeth 53 will engage the stops 65, the stops 65being so positioned to effect this engagement when the plug has beenrotated to cause a simmering flame on the service burner. To completelyclose the valve, it is necessary to again shove the stem inwardly tocarry the teeth 53 inwardly'from the stops 65,

and turn the same slightly toward cut-off position, after which the stemmay be released and the teeth 53 will engage and slide along the plate4'7 until the teeth again pass into alignment with the openings 5'7 andsnap into place therein to lock the valve in the closed position. Forclearness in illustration, radial lines, indicated at P P P and P havebeen shown on Fig. '7, the lines showing the rotated position of theclutch for different operating positions of the plug, the clutch beingin position P when the plug is in are placed for simultaneous the flowof gas to both the service and igniting v burners, the flow to thelatter being suflicient to permit only a simmering flame, as illustratedin Fig. 10, and in position P when the'plugis in the open position forfull operation of both burners, as illustrated in Fig. 11.

In some instances, it is desira le to provide a means for stoppingrotation of the plug in aposition to maintain the simmering condition ofthe service burner, as described above, which means will not onlypositively stop and hold the plug at this position but, if suflicienttorque were exerted on the stem to damage the plug or clutch, woulddisengage and permit rotation of the plug to closed position. Such anarrangement will assure the operator that the simmering position isreached more effectively thanthe usual snap action which permits easyadditional turning, and at the same time, will-prevent damage to thevalve by undue twisting of the stem by an uninstructed operator. Such ameans is illustrated in a modification shown in Fig. 12, wherein theparts corresponding to the parts above described are indicated by primenumbers corresponding to the numbers above used. Thus the clutch teeth53 may be provided on the edge leading in the direction of rotationfor'cutting off the gas with a comparatively steep cam surface 70,which,

upon engagement with the bridge or lug 60' will arrest rotation of theclutch, but which, when an extremely heavy torque is exerted on thestem, will lift up over the lug 60 and pass to the position in which theplug would cut off completely the supply of gas to both burners.

As above explained, the ignition burner insures lighting of the serviceburner promptly. In order to more effectively utilize the fueldischarged therefrom, the ignition burner may be in the form illustratedinFig. 13, wherein parts corresponding to the parts illustrated in Figs.1 to 3 are designated by corresponding primed numerals. In thisembodiment, the part of the top wall of the ignition burner in which thenozzle 26'- is mounted is stepped down below the level of the remainderof its top wall and the top wall of the burner arm 2, In this lowerportion of the top wall of the ignition burner and in the upper por-.

.toward the firing tube 23'. The offset between the top wall portions issuch as to bring the firing tube in position to discharge over the uppersurface of the burner arm 2'. Due to the vents 80, a body of fuel ismaintained from within the discharge end of the firing tube over thesurface of the ignition burner and burner arms 2', thus insuring a flashbetween the tube and burners. For a reason now unknown but apparentlybecause of swirling of the gas entering the head of the ignition burner,the discharge of gas therefrom is at a higher pressure or rate of flowthan from the service burner, even when the by-pass 13 is provided. andoperating, but too great an excess of fuel to the ignition burner willbe relieved through the by-pass and pass to the I r 1,989,101 7 that theinvention provides an efllcient means for increasing the rapidity of theignition oi the service burner from the pilot burner and foreil'ectively controlling the operation of the respective;g burners froma single operating valve or gas coc 7 Having thus described myinvention, I claim:

1. In a gas burning device, a pilot burner, a service burner, anignition burner in firing relation to the pilot burner and having adischarge vent in igniting relation to the service burner, individualmixing tubes leading one to the ignition burner and one to -the serviceburner, separate means for discharging gas into the respective mixingtubes, and means for passing excess air and gas from the ignition burnerinto the service burner. g

2. Ina gas burning device, a pilot burner, a service burner head, anignition burner. head in firing relation to the pilot burner and havinga discharge vent in igniting relation to the service burner head,individual mixing tubes leading one to the ignition burner head and oneto the service burner head respectively, each of said tubes and itsrespective burner head defining a chamber separate iromthe other tubeand its respective burner head, separate means for discharging gas intothe respective mixing tubes, and means for discharging excess air andgas from one of saidchambers into the other.

3. In a gas burning device, a pilot burner, a service burner, anignition burner in firing relation to the pilot burner and having adischarge vent in igniting relation to the service burner, individualmixing tubes arranged side by side and leading one to the ignitionburner and one to the service burner, separate means for discharging gasinto the respective mixing tubes, a continuously open by-pass ductcommunicating the ignition and service burners, said duct being spacedbelow the level of the discharge vent of the ignition burner.

4. In a gas burning device, a pilot burner, a

service burner, an ignition burner in firing relation to the pilotburner and having a discharge vent in firing relation to the serviceburner, individual mixing tubes leading one to the ignition burner andone to the service burner, separate gas nozzles for discharging gas intothe respective mixing tubes, and means for accelerating the initial flowof gas through the ignition burner mixing tube to the discharge vent oithe ignition burner said means comprising a by-pass duct directlycommunieatingwith the interiors of the ignition burner and the servicehumor.

6. In a gas burning device, a pilot burner, a service burner, anignition burner in firing relation to the pilot burner and having adischarge vent in firing relation to the service burner, in-

dividual mixing tubes leading to the ignition and service burnersrespectively, separate means for discharging gas into the respectivemixing tubes, and means for accelerating the initial flow of gas throughthe ignition burner mixing tube to the said discharge vent of theignition burner, said means comprising a by-pass duct directlycommunicating with the interior of the ignitio'm'and service burners,the end of said duct in the ignition burner lying out of the path ofdirect flow or gas passing into the ignition burner.

7. In a gas burning\d evice, a pair of burner heads having dischargevents, individual mixing tubes communicating with the respective burnerheads, a valve casing having discharge ducts discharging respectivelyinto said mixing tubes and an inlet duct communicating the interior ofthe casing with a source of gas, a rotatable plug in said casing havinga feed duct communicable with said inlet duct in one rotated positionotthe plug and having plug discharge ducts extending transversely of theplug and communicating with said feed duct and respectively with thedischarge ducts of the casing, said plug discharge ducts being of thesame diameter and in substantially the same position longitudinally ofthe plug, and being positioned relative to each other and to the casingdischarge ducts to effect communication of one with a casing dischargeduct, both beiore and during communication of 'the other and itsrespective casing discharge ductconsequent upon rotation of the plug,whereby gas is introduced to one of said burners priorto and during theintroduction of gas to the other.

8. In a gas burning device, a burner, a valve casing having ductsdischarging into said burner and communicating with a gas feed conduitrespectively, a rotatable plug in said casing adapted to vary the supplyof gas discharged to said burner consequent upon rotation of the plug topredetermined positions, a stem carried by said casing and mounted forindependent axial and rotary movement and operably connected to saidplug for rotating the same, whereby saidw plug may be rotated to efiecta simmering flame on said burner, a stop rigid with said casing, andaxially movable means rotatable by said stem and engageable with saidstop-in one rotated position for stopping rotation of the plug, saidmeans being positioned relative to the plug passages for stoppingrotation of the plug in said simmering position when the plug is rotatedfrom open toward a cut-off position, said means and stop beingdisengageable consequent upon axial movement of the stem whereby theplug may be rotated from the simmering position to cut-off position.

9. In a gas burning device, a. burner, a valve casing having ductsdischarging into said burner and communicating with'a gas feed conduitrespectively, a rotatable plug in said casing adapted to vary the supplyof gas discharged to said burner consequent upon rotation of they plugto predetermined positions, astem. carried by said casing and mountedfor independent axial and rotary movement and operably connected to saidplug for rotating the same, whereby said plug may be rotated to effect asimmering flame on said burner, a stop rigid with said casing, andaxially movable means rotatable by said stem and engageable with saidstop in one rotated position for stopping rotation of the plug, saidmeans being positioned relative to the plug passages for stoppingrotation of the plug in said simmering position when the plug is rotatedfrom open toward a cut-off position, said means and stop beingdisengageable consequent upon axial movement of the stem whereby theplug may be rotated from the simmering position to cut-oi! position, andmeans tor adjusting the position of 150 an ignition burnerintegraltherewith, said burn-- ers comprising a hollow body having upwardlydischarging exhaust vents and a. mixing tube leading into said body, apartition within said body and mixing tube, said partition extendinglongitudinally of said tube'and dividing the in- 1,982,101 'terior ofthe body into separate compartments and dividing said mixingtube intoseparate ehannels, one channel communicating with one compartment of thebody and one communicating with the other, a by-pass passage in saidpartition .wall' near the burner compartments and spaced below-thedischarge vents thereof.v

GEORGE HERBSTER;

